“双碳”背景下要求直流炉供热机组具备快速变负荷能力。对此,提出一种基于线性时变模型预测控制(linear time-varying model predictive control,LTV-MPC)的电热协调变负荷策略,可同时利用锅炉蓄热和热网蓄热以提高变负荷速率。首先,...“双碳”背景下要求直流炉供热机组具备快速变负荷能力。对此,提出一种基于线性时变模型预测控制(linear time-varying model predictive control,LTV-MPC)的电热协调变负荷策略,可同时利用锅炉蓄热和热网蓄热以提高变负荷速率。首先,对热负荷信号偏差进行积分从而建立等效热负荷模型,并将其作为预测模型的被控量之一;然后,以负荷快速跟踪、机组运行稳定以及供热及时补偿作为MPC滚动优化的目标,进而在线求解每个时刻的最优控制律并作用于机组,此外,显式处理了机组运行约束,确保供热抽汽流量变化不会影响低压缸运行稳定性;最后,基于某350 MW机组进行仿真验证,结果表明,该策略能够实现对5%Pe/min变负荷指令的精准跟踪,且相较于基于PID的电热协调变负荷策略,热负荷恢复时间缩短26%。仿真结果验证了所提策略在提升供热机组快速变负荷能力方面的优越性。展开更多
This work considers those road networks in which there are multi-route choices for bifurcation-destination(or origin-destination) pairs, and designs a real-time variable message sign(VMS)-based routing control strateg...This work considers those road networks in which there are multi-route choices for bifurcation-destination(or origin-destination) pairs, and designs a real-time variable message sign(VMS)-based routing control strategy in the model predictive control(MPC) framework. The VMS route recommendation provided by the traffic management authority is directly considered as the control variable, and the routing control model is established, in which a multi-dimensional control vector is introduced to describe the influence of route recommendations on flow distribution. In the MPC framework, a system optimum routing strategy with the constraints regarding drivers' acceptability with recommended routes is designed, which can not only meet the traffic management authority's control requirement but also improve drivers' satisfaction with the route guidance system. The simulation carried out shows that the proposed routing control can effectively mitigate traffic congestion, reduces followers' time delay, and improves drivers' satisfaction with routing control in road networks.展开更多
基金Projects(61304203,51409157)supported by the National Natural Science Foundation of ChinaProject(12ZR1444800)supported by the Natural Science Foundation of Shanghai,China
文摘This work considers those road networks in which there are multi-route choices for bifurcation-destination(or origin-destination) pairs, and designs a real-time variable message sign(VMS)-based routing control strategy in the model predictive control(MPC) framework. The VMS route recommendation provided by the traffic management authority is directly considered as the control variable, and the routing control model is established, in which a multi-dimensional control vector is introduced to describe the influence of route recommendations on flow distribution. In the MPC framework, a system optimum routing strategy with the constraints regarding drivers' acceptability with recommended routes is designed, which can not only meet the traffic management authority's control requirement but also improve drivers' satisfaction with the route guidance system. The simulation carried out shows that the proposed routing control can effectively mitigate traffic congestion, reduces followers' time delay, and improves drivers' satisfaction with routing control in road networks.
